Adaptive Super-Twisting Sliding Mode Direct Torque Control for Permanent Magnet Synchronous Motor
In view of the problems of overshoot and large torque ripple in direct torque control of perma-nent magnet synchronous motor,an adaptive Super-Twisting sliding mode control strategy is proposed.Firstly,the Super-Twisting sliding mode control is used to replace the traditional hysteresis comparison con-trol method to design the flux controller and torque controller.Secondly,building upon the foundation of Super-Twisting sliding mode control,further improvements are made by replacing the sign function with a hyperbolic tangent function and introducing an adaptive factor into the continuous part of the Super-Twis-ting sliding mode control,resulting in a new adaptive Super-Twisting sliding mode control strategy.Finally,a model is built using MATLAB/Simulink software to conduct simulation experiments on the direct torque control system of permanent magnet synchronous motor.The results show that the proposed improved Su-per-Twisting sliding mode controller could achieve zero overshoot control in the direct torque control sys-tem under various experimental conditions,with a torque ripple value of only 0.2 N·m,representing a re-duction of approximately 39%.
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